Use this program to ask (or "petition") the Family Court to change a support order if there is a "change in circumstances." This free program will help you fill out the petition that you will need to file in Family Court.IV-D Child Support Courts are located in the Family Law Center at 1115 Congress, Houston, TX 77002. The following forms are available for downloading, printing and completing. Information about Justice Court Suits and Civil Cases in the Harris County Justice of the Peace Courts. How do I fill out a notice of motion form in New York? I filed a paternity case for my daughter in 2013. A custodial parent may file a petition with their local child support agency. Harris County District Clerk - A range of forms are available, including for family, child support, civil, Texas Supreme Court, and others. You need to file a modification for child support.